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A Cost Effective Brushless D.C. Motor
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English
Abstract
The design and performance of a brushless d.c. motor with high power density using ferrite magnets and a two transistor drive is described.
The motor utilizes a single-phase operating principle which permits the use of an electronic drive circuit utilizing only two power switching devices, making it cost effective with a conventional d.c. commutator motor using P.W.M. speed control. High power density is obtained by the use of an external rotor construction and a multi-pole format with a concentrated winding. The starting problems normally associated with single-phase motors is addressed and an experimentally proven solution is described. Significant reduction in starting current is achieved as a no cost bonus and significant improvements in overall operating efficiency can be obtained if the power density is reduced to normal auto industry levels. This motor system is ideal for accessory drives requiring variable speed, long life and high power density at a cost level similar to existing automotive variable speed techniques.
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Citation
Turner, D., "A Cost Effective Brushless D.C. Motor," SAE Technical Paper 860475, 1986, https://doi.org/10.4271/860475.Also In
References
- Gritter, D.J. Gale, A.R. A Single -Phase Permanent Magnet A.C. Motor for Electric Vehicle Traction Proceedings EV Expo 83 Detroit 4 October 1983